Of course not morbid- is is totally normal. OH's died of his third heart attack aged 52, and for him, his 53rd birthday was a milestone. He will be 68 at the week-end, and due to his own health problems (kidney damage due to untreated strep throat when a medical student) never thought he would get to 60. He is going strong, thank goodness.
My own parents died aged 94 and 96- and for me it it he other way round- as I think they were so amazingly fit until well into their 80s. Enjoy this big milestone and look forward to the future and your great-grand-children.